Removable liquid frisket used to temporarily cover areas of paper and block paint. Pre-testing fluid on certain papers is recommended. ally this non-water-soluble and transparent-drying Liquid mask generously. When completely dry the resulting film can be overpainted with watercolour without the surace - paper boards, photographic prints or films - absorbing colour. When the film is dry it may also be rubbed off with india rubber or finger. Protect from frost. Rinse brushes in water immediately after use, and keep container tightly sealed.